o Bugfix to get_memusage.c for latest linux to read the proper value of
  datastack
  - Also: simplify code to read from /proc/self/statm
o Mods to auto-profiling of memory usage:
  - Only print when rss *grows*. This will decrease printout dramatically
  - Only print from thread 0. This will decrease printout dramatically
  - Add MPI rank to print if applicable
o Remove share and text prints from print_memusage.c
o Add "hidden" test code testbacktrace.F90